The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mailbox/brcm,iproc-pdc-mbox.txt

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    1 The PDC driver manages data transfer to and from various offload engines
    2 on some Broadcom SoCs. An SoC may have multiple PDC hardware blocks. There is
    3 one device tree entry per block.  On some chips, the PDC functionality is
    4 handled by the FA2 (Northstar Plus).
    5 
    6 Required properties:
    7 - compatible : Should be "brcm,iproc-pdc-mbox" or "brcm,iproc-fa2-mbox" for
    8   FA2/Northstar Plus.
    9 - reg: Should contain PDC registers location and length.
   10 - interrupts: Should contain the IRQ line for the PDC.
   11 - #mbox-cells: 1
   12 - brcm,rx-status-len: Length of metadata preceding received frames, in bytes.
   13 
   14 Optional properties:
   15 - brcm,use-bcm-hdr:  present if a BCM header precedes each frame.
   16 
   17 Example:
   18         pdc0: iproc-pdc0@612c0000 {
   19                 compatible = "brcm,iproc-pdc-mbox";
   20                 reg = <0 0x612c0000 0 0x445>;  /* PDC FS0 regs */
   21                 interrupts = <GIC_SPI 187 IRQ_TYPE_LEVEL_HIGH>;
   22                 #mbox-cells = <1>;   /* one cell per mailbox channel */
   23                 brcm,rx-status-len = <32>;
   24                 brcm,use-bcm-hdr;
   25         };

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